Hub brake for motor vehicles



AW@ Wm W. @NYMHM HUB BRAKE FOR MOTOR VEHICLES YYYEEYAM GEUNJGE BRYAN, UE SYDNEY, NEW SUU'EN WALES, ll

EN TNUMAS ETUAET GENE, AND EEECYYAE .1 m, aantonen animano snnaruna, nora or arosllMN, NEAR SYDNEY, NEW NEUEN WALES, AUSYEAEYA, AND EEYE EUY EYYEEY- 0E EIANJDWYGN, NEAR SYDNEY, NEW SUU'EN WAEEE, AUSYNAEYA.

HUE EEAEE EUR NEYUE YENYCEEE.

Application tied Narch 3,1322. Aerial llo. 51113413..

To all Iwhom it may concern:

lle it lrnovvn that l, Winntain Geenen WWEnrAN, a subject ot the lting ot Great Eritain and lreland, residing at ydney, A New South Wales, Australimhave invented certain new and usetul llmprove-ments in llub Brakes tor h/lo-tor Vehicles, oli' vvhlch the following is a specilication.

'l`his invention relates to Wheel hub braltes v.

lll oli' the expanding sector type, amnd it consists in an improved assembly et pair toggles acting on two oppositely dls'posed'hralre shoe sectors, and intermediate levers co-actlng Avvith said toggles` and controlled through 1t hand or pedal lever linlrage.

ln the` accompanying drawing,

Eig. 1 is a vertical 'sectional elevation ot a loralre according tothe present lnvention;

Eig. 2 is a transverse vertical section on the`line v2-2 ot Eig. 1; and`- f li 3 is a fragmentary sectional elevation showing the moditied arrangement 1n which the intermediate levers are operated trom the roch shatt by earns instead ot toggles.

ln Eigs.-1 and 2--12 is a lined `dlsc or t head on which the sector shoes 13 and 141-.

are carried and on which the linkage 1s mounted. Vlhis head is as usual immovably held by the axle casing structure so that 1t to terms a fined base to receive the thrust or dragiot the brake.. rlhe sector shoes 13 and 1l are semi-circular and when spread apart by the linlrage bear outwardly against the interior tace ot the rim portion 15 ot the ta brake drum which is tired to the wheel. 16 f and 17 are guide studs tired to the head 12, and 13 arcguide stop lugs on the brake shoes vvhich take against the sides ot said studs 16 and 17 and transmit the drag of the brake through V them to the head 12. 19 are stops tired to the head 12 and located so that in the retired position the opposed ends ot bralte shoes 13 and 111 set baclr against them,

Ell

and the laces ol the shoes set clear of contact vvith the brake drum rim.

Near either end ot it each hralre shoe is litted with a lug 21 drilled to carry a vvrist pin 22. Yl`hese pins 22 pivotally connect the outer ends ot the toggle arms S23-23, 2l-2l to the shoes 13 and 1t respectively. rlhe toggle arms 23-23 are in sections connected hy a lett-and-right hand nut 25 tornaing a levers are tulcrunned on studs iid-31).hiredy in the head 12. 31 is aretiring spring set in tension and tunctioning to pull the ovver ends ot the levers 29-23 inward. @ai lever endsare connected by pivoted linlrs 32-32 to thecranlr Y arms on the rock spindle 33 which is rotatably mounted in a bushing 3l I I tired on the head 12 and carries on its outer end the loralre rigging lever 35. 'l`he entension arm 36' (shown dotted) is provided on the head 12 in the case ot motor-cycle equipments to provide 'an anchorage Vtor the head to revent its rotation by the drag ot the hra te.

ln. Eig. 3 adouble cam 37 is fitted on the roclr spindle 33 to act against anti-friction rollers 33--33 on the power ends ot the intermediate levers to talre the place ot the..`

cranlntoggle arrangement shown in Figs. 1 and 2.

`illlhen the bralte rigging is slaclr, the retiring springs 3 1 pulls the brake shoes clear ot the brake drum rim and holds all the joints taut., vvith the shoes contactinguvvith the stop checlrsl 19, thereby preventing rattle. Adjustment tor `vvear is provided by the turnbu'c-lrles 25. llhen the brake rigging is drawn taut, the spindle 33 is roclred; thereby through the toggle links 32 or the double earn 37 spreading the intermediate levers 29-29 and extending the toggles 23 and 2t and so forcing thesec-tor shoes 13 and 14: apart into braking contact with. the bralre drum rim 15. ln the reverse action, the spring 31 tunctions to retire the parts to the tree position shown in the drawings.

What l claim as my invention and desire to secure by Letters Eatent is 1. ln a hub bralre ot the type wherein tvvo diametrally movable sector shoes mounted on a aed head :trictionall engage the rim ot a hralte drumaa pair o toggles connecting the'respective'contiguous ends ot said lllltl plate, toggles acting between the contiguous ends of said shoes, a turnbuckle adjustment on one arm of each of -said toggles, levers fulcrumed 0n said back plate and linked to the elbow joints of said toggles, a helical spring in tension connecting said levers, a rock shaft with T-head and a lever arm adapted to be .engaged vby brake rigging` n bushed bearing for said shaft fixe-d in said back plate, and means intermediate said levers and said T-head adapted for moving,r said levers obediently to the rotation of said T-head.

3. Ina brake mechanism, the combination of a pair ot' expansible brake shoes, a pair of toggles connected to said shoes, one arm of each of said toggles comprising a turnbuckle device, means for operating said toggles to expand said shoes, and a spring actingr upon the operating means for both of said toggles thereby to retire `the same into inoperative position.

In testimony whereofl I aflix my signature.

WILLIAM GEORGE BRYAN. 

